So my car is leaking oil in two places...the front crank seal and the rear main seal. Looks like a common thing with high mileage M54's. The front seems pretty straight forward from what I read, but I am debating doing the rear main seal, or whether i should just let it be and add oil as it needs it. So lets say I replace the seal, I know it requires dropping the transmission, and I am curious if anyone has done this job, or if I should just take it somewhere and have it done...any insight/advice/guidance on this would be much appreciated! Thanks!